Why fourth graders? Those behind the program say research shows children ages nine to 11 are beginning to learn about the world around them.

They’re not only open to new ideas, but they are likely to connect to nature and America’s history.

The pass is offered to fourth graders every year, so eventually, every child will get a free pass to explore our national parks, with a goal of letting them all discover wildlife, resources and history — for free.

Click here for a list of some of the parks you’ll be able to visit with your free pass. Do you have a favorite national park?

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